3 files changed, 11 insertions, 5 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/session/cookie_store.rb b/actionpack/lib/action_dispatch/middleware/session/cookie_store.rb
index 8ebf870b95..29e9e6c261 100644
--- a/actionpack/lib/action_dispatch/middleware/session/cookie_store.rb
+++ b/actionpack/lib/action_dispatch/middleware/session/cookie_store.rb
@@ -59,7 +59,7 @@ module ActionDispatch
       end
 
       def set_session(env, sid, session_data, options)
-        session_data.merge("session_id" => sid)
+        session_data.merge!("session_id" => sid)
       end
 
       def set_cookie(env, session_id, cookie)
diff --git a/actionpack/lib/action_pack/version.rb b/actionpack/lib/action_pack/version.rb
index edc0cc97a7..00e9277c9d 100644
--- a/actionpack/lib/action_pack/version.rb
+++ b/actionpack/lib/action_pack/version.rb
@@ -2,8 +2,8 @@ module ActionPack
   module VERSION #:nodoc:
     MAJOR = 3
     MINOR = 2
-    TINY  = 2
-    PRE   = nil
+    TINY  = 3
+    PRE   = "rc1"
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join('.')
   end
diff --git a/actionpack/lib/action_view/renderer/partial_renderer.rb b/actionpack/lib/action_view/renderer/partial_renderer.rb
index 17aa85555c..25c41f042b 100644
--- a/actionpack/lib/action_view/renderer/partial_renderer.rb
+++ b/actionpack/lib/action_view/renderer/partial_renderer.rb
@@ -221,6 +221,14 @@ module ActionView
       setup(context, options, block)
       identifier = (@template = find_partial) ? @template.identifier : @path
 
+      @lookup_context.rendered_format ||= begin
+        if @template && @template.formats.present?
+          @template.formats.first
+        else
+          formats.first
+        end
+      end
+
       if @collection
         instrument(:collection, :identifier => identifier || "collection", :count => @collection.size) do
           render_collection
@@ -273,8 +281,6 @@ module ActionView
       @block   = block
       @details = extract_details(options)
 
-      @lookup_context.rendered_format ||= formats.first
-
       if String === partial
         @object     = options[:object]
         @path       = partial